Question: High-efficiency condensing HVAC systems produce excessive _______________.

Answer: condensate

Question: Forced-air furnaces function primarily by ________.

Answer: convection

Question: Radiation is the transfer of heat energy by _________________.

Answer: electromagnetic wave motion

Question: Heat can move from one body to another by _________.

Answer: radiation

Question: Heat is transferred _____________.

Answer: in direct rays

Question: Heat transferred within a gas or liquid happens via __________.

Answer: convection

Question: Heat transferred through a solid happens via __________.

Answer: conduction

Question: If the heating system is a high-efficiency, gas-fired furnace, then the heat-conveying medium is _____.

Answer: air

Question: is what carries the heat from the source to the enclosure being heated.

Answer: The heat-conveying medium

Question: A(n) _______ furnace is also referred to as a counter-flow furnace or a down-draft furnace.

Answer: downflow